Four-cycle internal-combustion engine.



T. s. JAMES. FOUR-CYCLE INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JUNE 13, 1913.

Patnted July 28,1914.

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I60 dbl 37v e6- I jf v'tja/ 666 ca Attormsyprovements 1n and Relating THOMAS SPENCER JAMES, OF PECKHAM, LONDON, ENGLAND.

FOUR-CYCLE INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented July 28, 1914:.

Application filed June 1:3, 1913. Serial No. 773,551.

T 0 all whom it may concern Be it known that I, THOMAS SPENCER JAMES, a citizen of the United Kingdom of Great Britain and Ireland, and resident of 16 Edith road, Peckham, London, England, have invented certain new and useful Imto Four-Cycle Internal-Combustion Engines, of which the following is a specification, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to internal combustion engines of the-piston and cylinder type and in particular to improved means for causing the piston to. travel farther rearwardly when on the exhaust stroke than it does upon the other strokes, the primary object of the invention being to completely evacuate the cylinder of all burnt gases and to increase the suction stroke so as to draw in greater charge of combustible gas than is usual. The throw of the other two strokes of the piston necessary to complete the cycle of operations, namely .compression and firing, are preferably the same and as usual. The piston rod has a telescopic action and is caused to increase and decrease its length as by means of a drum around the rod upon which drum is a cam track, the said drum being rotated by means of two toothed wheels one integral with the drum and the other on the crank of the engine.

.I will now describe my invention with reference to the accompanying drawings which show a construction in w ich the said drum and cam wheels are employed.

Figure 1 shows the engine in elevation the cylinder and crank case being indicated by plain lines and the drum and someof the parts being shown in section, while Fig. 2 is a development of the cam track. a

The cylinder and crank casea is of usual type as is also the piston 12 and the crank pin 0 and axle d. The connecting rod is of compound and telescopic construction and consists of two parts e and f of which e is connected at e to the piston in usual manner, while the part f which telescopes within the part c is connected to the crank pin bearing the arrangement being such that the parts 6 and f move in relation to each other. The lower end of the part 6 is increased in diameter to receive a drum 1 in which the cam track it is made. I screw 21 provided with a roller 7' is fitted within the lower end of the part (2 so that the said roller travels in the cam track it while the to and fro movement of the part e on the part f is permitted by the side slots 70- in which the pins Z travel. The lower end of the drum is furnished with a bevel wheel at which is in constant mesh and is driven by a smaller bevel wheel a secured on the crank pin.

In this drawing thepiston is shown by full lines in its normal rearward position but it will be obvious that as the engine rotates, the wheel at will drive the wheel a and thus turn the cam drum 9 which will have the effect of lifting the roller and thus raising the sleeve part c and increasing the distance between the crank pin and the gildgeon pin 6' thereby thrusting the piston farther back within the cylinder as shown 2y the dotted lines and it will be seen from ig. 2 that while a large part of the cam track B is straight the curved portion A will raise the piston to this maximum rearward position every fourth stroke and it will be thus clearly seen that'the engine having been adjusted, and this stroke being the ex-- haust stroke, the whole of the burnt gases will be expelled and because the next outward stroke is the suction stroke a larger volume of combustible gases will be drawn in.

The engine illustrated is shown without valves and other parts, and as to my invention, without details whereby one part can be adjusted in relation to another but it will be understood that such of these parts as are necessary are employed and that the invention can be carried out in several manners within the scope of the following claims.

What I claim and desire to secure by'Lett'ers Patent is 1. In an internal combustion engine, the combination of a cylinder, piston and crank shaft, a telescopic piston rod connecting the crank shaft and piston, means including a rotating element operable with and mounted on the telescopic shaft to separate and expand the telescopic shaft, whereby to cause the piston to travel farther outwardly on the ,exhaust stroke than it does on the other strokes in the cycle of operation, and means on the crank shaft for operating the rotating element.

2. An internal combustion engine having a telescopic piston rod, a crank pin a pin ion on the crank pin, a pinion co-axial with the piston rod and meshing with the piston on the crank pin, a drum connected to the pinion and having in it a cam track, and a projection on one member of the telescopic piston rod to engage the cain track and increase the throw of the piston.

23. An internal combustion engine having a telescopic piston rod comprising inner and outer parts a crank pin, a drum within the outer part, said drum having in it a cam track and fixed to it a pinion, a roller mounted upon the outer art of the piston rod adapted to travel in tii in the inner part of the piston rod adapted to travel slots in the outer part of the rod and a 1pinion on the crank pin adapted to drive tie pinion on the drum.

4. An internal combustion engine having a piston furnished with a telescopic rod comprising inncr and outer parts adapted to slide one on the other a crank in, slots in the outer part, pins projecting tom the innor part into the said slots, a pinion coaxial with the piston rod and having on it a drum provided with a cam track in which a roller carried by the outer part of the piston rod is adapted to travel and a pinion on the crank pin adapted to drive the pinion having the drum.

5. In an internal combustion engine, the combination of a cylinder, piston and crank shaft, means including a telescopic piston rod and cam thereon interposed between the crank shaft and piston to cause the latter to make a longer stroke outwardly when exhausting the burnt gases than it does when making the other strokes in the cycle of operation, and means for'operating the cam.

(S. In an internal combustion engine, the combination of a cylinder, piston and crank shaft, of a telescopic piston rod connecting the crank shaft and piston, and means including gears operated by the crank to separate the telescopic piston rod to increase the outward movement of the piston rod on the exhaust stroke of the engine.

7. In an internal combustion engine, the combination of a cylinder, piston and crank shaft, a telescopic connecting rod between the crank shaft and the piston, means ineluding a device interposed between the tele scopic members of the piston rod to increase one outward stroke in a series of strokes of the piston, and means operated by the crank shaft for actuating the first mentioned means.

8. In a four cycle internal combustion engine, the combination of a cylinder, piston e cam track, pins and crank shaft, a connecting rod between the crank shaft and the piston, means including a rotatable cam for causing the piston to travel farther outwardly on its exwhich is formed with slots and the other. of

which is rovided with pins to engage said slots, a rum inclosed in one of the telescopic members, said drum having a cam track, a projection on the inclosing telescopic member to engage the cam track, a gear on the drum, and a gear on the crank shaft to engage the gear on the drum, whereby to cause the cam to increase the outward throw of one stroke in a series of strokes of the piston. v

10. In an internal combustion engine, the combination of a cylinder, piston and crank shaft, a telescopic connecting rod between the crank shaft and the piston, said connecting rod comprising two members, one of which is formed with pins to engage said slots, a drum inclosed in one of the telescopic members, said drum havin a cam track, a projection on the inclosing telescopic member to engage the cam track, and means on the crank shaft for operating the drum to cause the cam track to increase one of a series of outward movements of the piston.

11. In a four cycle internal combustion engine, the combination of a cylinder, piston and crank shaft, a piston rod connecting the iston and crank shaft, and means for causing the piston to travel'farther on its outward exhaust stroke than it does on the other outward stroke and to cause said piston to travel farther on its inward gasintake stroke than it does on the other inward stroke.

In witness whereof I have hereunto set my hand in presence of two witnesses.

THOMAS SPENCER JAMES.

\Vitnesses:

H. D. JAMEsoN, O. J. I/VORTH. 

